Use shorting encoding for mov reg, imm.

src/assembler-ia32.cc

Index: src/assembler-ia32.cc
diff --git a/src/assembler-ia32.cc b/src/assembler-ia32.cc
index 610542b596e7f6fa26b7e48bd1c353ea076172bd..264ef4237e318e193ef634adf9aa44d13efa7dc7 100644
--- a/src/assembler-ia32.cc
+++ b/src/assembler-ia32.cc
@@ -597,6 +597,14 @@ void Assembler::mov(Register dst, int32_t imm32) {
 }
 
 
+void Assembler::mov(Register dst, const Immediate& x) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  EMIT(0xB8 | dst.code());
+  emit(x);
+}
+
+
 void Assembler::mov(Register dst, Handle<Object> handle) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
@@ -613,6 +621,14 @@ void Assembler::mov(Register dst, const Operand& src) {
 }
 
 
+void Assembler::mov(Register dst, Register src) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  EMIT(0x89);
+  EMIT(0xC0 | src.code() << 3 | dst.code());
+}
+
+
 void Assembler::mov(const Operand& dst, const Immediate& x) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;